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x in (-oo:+oo)
(8/9)*x-(2/3) = 4 // - 4
(8/9)*x-(2/3)-4 = 0
(8/9)*x-2/3-4 = 0
8/9*x-14/3 = 0 // + 14/3
8/9*x = 14/3 // : 8/9
x = 14/3/8/9
x = 21/4
x = 21/4
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